From: Arnd Bergmann <arnd@xxxxxxxx>
Subject: mm/gup.c: fix access_ok() argument type
MIPS just got changed to only accept a pointer argument for access_ok(),
causing one warning in drivers/scsi/pmcraid.c. I tried changing x86 the
same way and found the same warning in __get_user_pages_fast() and nowhere
else in the kernel during randconfig testing:
mm/gup.c: In function '__get_user_pages_fast':
mm/gup.c:1578:6: error: passing argument 1 of '__chk_range_not_ok' makes pointer from integer without a cast [-Werror=int-conversion]
It would probably be a good idea to enforce type-safety in general, so
let's change this file to not cause a warning if we do that.
I don't know why the warning did not appear on MIPS.
Fixes: 2667f50e8b81 ("mm: introduce a general RCU get_user_pages_fast()")
Link: http://lkml.kernel.org/r/20170421162659.3314521-1-arnd@xxxxxxxx
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/gup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/gup.c~mm-gup-fix-access_ok-argument-type mm/gup.c
--- a/mm/gup.c~mm-gup-fix-access_ok-argument-type
+++ a/mm/gup.c
@@ -1575,7 +1575,7 @@ int __get_user_pages_fast(unsigned long
end = start + len;
if (unlikely(!access_ok(write ? VERIFY_WRITE : VERIFY_READ,
- start, len)))
+ (void __user *)start, len)))
return 0;
/*
_
--
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